ObjectiveTo evaluate three-dimensional translational setup errors and residual errors
in image-guided radiosurgery, comparing frameless and frame-based
techniques, using an anthropomorphic phantom.Materials and MethodsWe initially used specific phantoms for the calibration and quality control
of the image-guided system. For the hidden target test, we used an Alderson
Radiation Therapy (ART)-210 anthropomorphic head phantom, into which we
inserted four 5mm metal balls to simulate target treatment volumes. Computed
tomography images were the taken with the head phantom properly positioned
for frameless and frame-based radiosurgery.ResultsFor the frameless technique, the mean error magnitude was 0.22 ± 0.04
mm for setup errors and 0.14 ± 0.02 mm for residual errors, the
combined uncertainty being 0.28 mm and 0.16 mm, respectively. For the
frame-based technique, the mean error magnitude was 0.73 ± 0.14 mm
for setup errors and 0.31 ± 0.04 mm for residual errors, the combined
uncertainty being 1.15 mm and 0.63 mm, respectively.ConclusionThe mean values, standard deviations, and combined uncertainties showed no
evidence of a significant differences between the two techniques when the
head phantom ART-210 was used.
Of the selected patients, 80% had ≥81-95% of the Vol within 100% of the prescribed dose and predominantly had central or in-field recurrences. These results are comparable with those from the literature.
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